Be equal to change in uniform (7)
I believe the answer is:
equable
'uniform' is the definition.
(I've seen this in another clue)
'be equal to change' is the wordplay.
'to change' indicates an anagram.
'be'+'equal'='beequal'
'beequal' is an anagram of 'EQUABLE'.
'in' acts as a link.
(Other definitions for equable that I've seen before include "Cool" , "not easily rattled" , "composed" , "Placid; unvarying" , "Good-natured" .)